Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fd30ea0f26e6cd…

MALICIOUS

PDF

93.5 KB Created: 2021-08-03 21:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d1cd0bf6ed0c8c70579ab31fd4cf3a4 SHA-1: 1644c29e7d9c7b66bcaeaacc706170dae22e3d0f SHA-256: a8fd30ea0f26e6cdeb3cb6a8e039577c4e2e0a47745b86014a8d502a88666b7e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=5+second+rule+jr+game+questions PDF link annotation
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dc80c49c51a484d3bcf65d74a4a6eaea/nazidunerekegodiwe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f1b95504b37a74da4abdd70cfaf6a6ab/pesisimawefebunol.pdfIn PDF document text
    • http://dzbnf.com/upload/file///gidusige.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/nexatabanesik.pdfIn PDF document text
    • http://amandamaitland.com/images/file/gusumobezelub.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82fd91e8e---zazoronopoverinudijel.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/86837948436.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/71816190744.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/goraledavoxotijiripak.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837cf8d7d6d---7967625013.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/mcrc3u8nill7opvg2qbma83m0r/xiredarutikatujom.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/majurixaxavawojuzab.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805da64d028---70465014547.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768980c3ad7---66113595840.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/16387e87e06a0ee157227c874f472146/wekid.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/60036551327.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/movuri.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/luwivab.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4e93454cfbd631527e80e5e69bb7bddd/piruguzanaj.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/17835690972.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/rofagixadeninizika.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/vileje.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/12484034635.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 11124 bytes
SHA-256: a3f8814059797ff008a23b4f2ef1b4cc45d258f6c95c19b49094b66c85282ec1
font_01_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 16940 bytes
SHA-256: ffa5ed42ea24483090332586a3e2c38f76c4a6e5a967c89ec334d1afc7338105
font_02_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
font_03_sfnt_off00014ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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